Self-healing cement

Abstract

A method of cementing a wellbore includes forming a cement slurry by combining a nanocellulose, an amine component, a cement component, and an aqueous carrier; injecting the cement slurry into the wellbore; and allowing the cement slurry to set, thereby cementing the wellbore.

1 . A method of cementing a wellbore, the method comprising:
 forming a cement slurry by:   combining a nanocellulose and an amine component comprising amine-functionalized inorganic nanoparticles to form a gel,   adding a cement component and an aqueous carrier to the gel;   injecting the cement slurry into the wellbore; and allowing the cement slurry to set, thereby cementing the wellbore.   
     
     
         2 . (canceled) 
     
     
         3 . The method of  claim 1 , wherein the nanocellulose comprises a cellulose nanocrystal, a cellulose nanofiber, or a bacterial nanocellulose. 
     
     
         4 . The method of  claim 1 , wherein a content of the nanocellulose is about 0.05 to about 10 weight percent based on a weight of the cement component, and the nanocellulose comprise a crystallinity greater than or equal to 85% 
     
     
         5 . The method of  claim 1 , wherein the amine component comprises at least a diamine, a polyamine, or an aminopolymer. 
     
     
         6 . The method of  claim 1 , wherein the amine component comprises a polyethyleneimine. 
     
     
         7 . (canceled) 
     
     
         8 . The method of  claim 1 , wherein a content of the amine component in the cement slurry is about 0.05 to about 5 weight percent based on a weight of the cement component. 
     
     
         9 . The method of  claim 1 , wherein forming the cement slurry further comprises adding the cement component, the aqueous carrier, and an additive to the gel. 
     
     
         10 . The method of  claim 9 , wherein the additive comprises at least one of a dispersant, a setting accelerator, a setting retardant, a gelling agent, a fluid loss control agent, an extender, a defoamer, a weighting agent, a thixotropic agent, a bridging agent or lost circulation material, a silicate material, or a clay stabilizer. 
     
     
         11 . The method of  claim 9 , wherein the additive comprises a dispersant. 
     
     
         12 . The method of  claim 11 , wherein the dispersant comprises at least one of a naphthalene sulfonate formaldehyde condensate, an acetone formaldehyde sulfite condensate, or a glucan delta lactone derivative. 
     
     
         13 . The method of  claim 11 , wherein a content of the dispersant in the cement slurry is about 0.05 to about 5 weight percent based on a weight of the cement component. 
     
     
         14 . The method of  claim 10 , wherein the cement slurry comprises about 0.05 to about 10 weight percent of the cellulose nanocrystal, about 0.05 to about 10 weight percent of the amine component, about 0.01 to about 2 weight percent of a dispersant, and about 10 to about 120 weight percent of the aqueous carrier, each based on a weight of the cement component. 
     
     
         15 . The method of  claim 1 , wherein the cement slurry has a density of about 7 to about 22 pounds per gallon. 
     
     
         16 . A cement slurry comprising,
 a cement component;   about 0.05 to about 10 weight percent of a nanocellulose;   about 0.05 to about 10 weight percent of an amine component; and   about 10 to about 120 weight percent of an aqueous carrier, each based on a weight of the cement component.   
     
     
         17 . The cement slurry of  claim 16 , wherein the amine component comprises at least a diamine, a polyamine, or an aminopolymer, and the nanocellulose comprises a cellulose nanocrystal. 
     
     
         18 . The cement slurry of  claim 16 , wherein the amine component comprises a polyethyleneimine. 
     
     
         19 . The cement slurry of  claim 16 , wherein the amine component comprises amine-functionalized inorganic nanoparticles. 
     
     
         20 . The cement slurry of  claim 16 , wherein the cement slurry further comprises an additive comprising at least one of a dispersant, a setting accelerator, a setting retardant, a gelling agent, a fluid loss control agent, an extender, a defoamer, a weighting agent, a thixotropic agent, a bridging agent or lost circulation material, a silicate material, or a clay stabilizer.